Pediatrics published research on the relationship of IQ to motor skills. Data on motor skills and IQ was assessed on 460 children in educational and clinic settings. The results of the data analysis indicated that typical and atypical motor skills were seen at all levels of IQ. In addition the following was seen:
"for each SD lower IQ, a mean loss of 10 percentile motor points should be expected".Overall, children in the study with a lower IQ showed poorer motor performance more often than children with a higher IQ.
Reference: Bouwien Smits-Engelsman and Elisabeth L. Hill. The Relationship Between Motor Coordination and Intelligence Across the IQ Range. Pediatrics 2012; 130:4 e950-e956; published ahead of print September 17, 2012, doi:10.1542/peds.2011-3712